Consulta: creatorFacets:"Beiras, R"
Registros recuperados: 2
Data/hora: 10/06/2024 06:28:25

Effects of dissolved mercury on embryogenesis, survival and growth of Mytilus galloprovincialis mussel larvae
Provedor de dados: 5
Autores: Beiras, R; His, Edouard.
The effects of Hg concentrations ranging from 0 (control) to 1024 mu g l(-1) upon embryogenesis, survival and growth of Mytilus galloprovincialis mussel larvae were investigated. Embryogenesis was abnormal in 50% of the individuals at 10 mu g l(-1). The 48 h LC(50) for D-shaped, early umbonate, late umbonate and eyed larvae were 51, 164, 322 and 383 pg l(-1) respectively. The LC(50) was an allometric function of ash-free dry weight with exponent b = 0.60. Larval growth was significantly reduced after 6 d exposure to 4 mu g Hg l(-1) and after 10 d exposure to 2 mu g l(-1). No significant differences in lethal or sublethal sensitivity to Hg were found between M. galloprovincialis and previously studied Crassostrea gigas embryos and larvae. The implications...
Tipo: Text
Palavras-chave: Mercury; Mytilus; Mussel; Larva; Growth; Embryo; Bioassay; Ecotoxicology.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00258/36946/35665.pdf

Ingestion and contact with polyethylene microplastics does not cause acute toxicity on marine zooplankton
Provedor de dados: 5
Autores: Beiras, R; Bellas, J.; Cachot, J; Cormier, B.; Cousin, Xavier; Engwall, M.; Gambardella, C.; Garaventa, F.; Keiter, S.; Le Bihanic, F.; Lopez-ibanez, S.; Piazza, V.; Rial, D.; Tato, T.; Vidal-linan, L.
Toxicity of polyethylene microplastics (PE-MP) of size ranges similar to their natural food to zooplanktonic organisms representative of the main taxa present in marine plankton, including rotifers, copepods, bivalves, echinoderms and fish, was evaluated. Early life stages (ELS) were prioritized as testing models in order to maximize sensitivity. Treatments included particles spiked with benzophenone-3 (BP-3), a hydrophobic organic chemical used in cosmetics with direct input in coastal areas. Despite documented ingestion of both virgin and BP-3 spiked microplastics no acute toxicity was found at loads orders of magnitude above environmentally relevant concentrations on any of the invertebrate models. In fish tests some effects, including premature or...
Tipo: Text
Palavras-chave: Polyethylene; Marine litter; Marine zooplankton; Benzophenone-3; Embryo-larval bioassays.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00452/56369/57965.pdf